Jungle.
I think that being jungle it's not easy, I mean, I know you don't need to last hit minions or win a lane, but you need to know how to gank (Help in another lane.) when can you gank and how.
You can also counterjungle your enemy jungle too, but only with some champs that have a good early game.
Another important think it's that you need to smite thinks. If you're doing drake or baron (some jungle monsters which gives a bonus to your team.) and there it's the enemy jungle, he/she can steal it, so you need to smite it better than him to have the bonus.
(Idk, I don't know how to explain this better, play the game if you want to see it.)
In this lane are used fighters, tanks and assasins, you can use almost all the champs here, only if you know how to use them, the only think it's that there are champs which have more facility to do the jungle monsters or gank.